Expand child column by default

Hi,
I am using rad grid. In that I have designed 3 level hierarchy.
Thus when I click on '+' sign of first level it expands. When I click on '+' sign of second level it expands.

Now my requirement is that I want this second level to be expanded by default without clicking on the '+' sign. Thus when I click on first level it should be expanded and it that I can see the third level in expanded format be default.

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